content: /* Copyright (C) 2016-2018 Alibaba Group Holding Limited
  
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
  You may obtain a copy of the License at
  
      http://www.apache.org/licenses/LICENSE-2.0
  
  Unless required by applicable law or agreed to in writing, software
  distributed under the License is distributed on an "AS IS" BASIS,
  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
  See the License for the specific language governing permissions and
  limitations under the License.
  ==============================================================================*/
  
  /*
   * Protocol Buffers - Google's data interchange format
   * Copyright 2014 Google Inc.  All rights reserved.
   * https://developers.google.com/protocol-buffers/
   *
   * Redistribution and use in source and binary forms, with or without
   * modification, are permitted provided that the following conditions are
   * met:
   *
   *     * Redistributions of source code must retain the above copyright
   * notice, this list of conditions and the following disclaimer.
   *     * Redistributions in binary form must reproduce the above
   * copyright notice, this list of conditions and the following disclaimer
   * in the documentation and/or other materials provided with the
   * distribution.
   *     * Neither the name of Google Inc. nor the names of its
   * contributors may be used to endorse or promote products derived from
   * this software without specific prior written permission.
   *
   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
   * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
   * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
   * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
   * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
   * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
   * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
   * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   */
  
  package com.google.protobuf.jruby;
  
  import com.google.protobuf.DescriptorProtos;
  import com.google.protobuf.Descriptors;
  import org.jruby.Ruby;
  import org.jruby.RubyClass;
  import org.jruby.RubyModule;
  import org.jruby.RubyObject;
  import org.jruby.RubyNumeric;
  import org.jruby.anno.JRubyClass;
  import org.jruby.anno.JRubyMethod;
  import org.jruby.runtime.Block;
  import org.jruby.runtime.ObjectAllocator;
  import org.jruby.runtime.ThreadContext;
  import org.jruby.runtime.builtin.IRubyObject;
  
  @JRubyClass(name = "EnumDescriptor", include = "Enumerable")
  public class RubyEnumDescriptor extends RubyObject {
      public static void createRubyEnumDescriptor(Ruby runtime) {
          RubyModule mProtobuf = runtime.getClassFromPath("Google::Protobuf");
          RubyClass cEnumDescriptor = mProtobuf.defineClassUnder("EnumDescriptor", runtime.getObject(), new ObjectAllocator() {
              @Override
              public IRubyObject allocate(Ruby runtime, RubyClass klazz) {
                  return new RubyEnumDescriptor(runtime, klazz);
              }
          });
          cEnumDescriptor.includeModule(runtime.getEnumerable());
          cEnumDescriptor.defineAnnotatedMethods(RubyEnumDescriptor.class);
      }
  
      public RubyEnumDescriptor(Ruby runtime, RubyClass klazz) {
          super(runtime, klazz);
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.new => enum_descriptor
       *
       * Creates a new, empty, enum descriptor. Must be added to a pool before the
       * enum type can be used. The enum type may only be modified prior to adding to
       * a pool.
       */
      @JRubyMethod
      public IRubyObject initialize(ThreadContext context) {
          this.builder = DescriptorProtos.EnumDescriptorProto.newBuilder();
          return this;
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.name => name
       *
       * Returns the name of this enum type.
       */
      @JRubyMethod(name = "name")
      public IRubyObject getName(ThreadContext context) {
          return this.name;
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.name = name
       *
       * Sets the name of this enum type. Cannot be called if the enum type has
       * already been added to a pool.
       */
      @JRubyMethod(name = "name=")
      public IRubyObject setName(ThreadContext context, IRubyObject name) {
          this.name = name;
          this.builder.setName(Utils.escapeIdentifier(name.asJavaString()));
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.add_value(key, value)
       *
       * Adds a new key => value mapping to this enum type. Key must be given as a
       * Ruby symbol. Cannot be called if the enum type has already been added to a
       * pool. Will raise an exception if the key or value is already in use.
       */
      @JRubyMethod(name = "add_value")
      public IRubyObject addValue(ThreadContext context, IRubyObject name, IRubyObject number) {
          DescriptorProtos.EnumValueDescriptorProto.Builder valueBuilder = DescriptorProtos.EnumValueDescriptorProto.newBuilder();
          valueBuilder.setName(name.asJavaString());
          valueBuilder.setNumber(RubyNumeric.num2int(number));
          this.builder.addValue(valueBuilder);
          return context.runtime.getNil();
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.each(&block)
       *
       * Iterates over key => value mappings in this enum's definition, yielding to
       * the block with (key, value) arguments for each one.
       */
      @JRubyMethod
      public IRubyObject each(ThreadContext context, Block block) {
          Ruby runtime = context.runtime;
          for (Descriptors.EnumValueDescriptor enumValueDescriptor : descriptor.getValues()) {
              block.yield(context, runtime.newArray(runtime.newSymbol(enumValueDescriptor.getName()),
                      runtime.newFixnum(enumValueDescriptor.getNumber())));
          }
          return runtime.getNil();
      }
  
      /*
       * call-seq:
       *     EnumDescriptor.enummodule => module
       *
       * Returns the Ruby module corresponding to this enum type. Cannot be called
       * until the enum descriptor has been added to a pool.
       */
      @JRubyMethod
      public IRubyObject enummodule(ThreadContext context) {
          if (this.klazz == null) {
              this.klazz = buildModuleFromDescriptor(context);
          }
          return this.klazz;
      }
  
      public void setDescriptor(Descriptors.EnumDescriptor descriptor) {
          this.descriptor = descriptor;
      }
  
      public Descriptors.EnumDescriptor getDescriptor() {
          return this.descriptor;
      }
  
      public DescriptorProtos.EnumDescriptorProto.Builder getBuilder() {
          return this.builder;
      }
  
      private RubyModule buildModuleFromDescriptor(ThreadContext context) {
          Ruby runtime = context.runtime;
          Utils.checkNameAvailability(context, name.asJavaString());
  
          RubyModule enumModule = RubyModule.newModule(runtime);
          for (Descriptors.EnumValueDescriptor value : descriptor.getValues()) {
              enumModule.defineConstant(value.getName(), runtime.newFixnum(value.getNumber()));
          }
  
          enumModule.instance_variable_set(runtime.newString(Utils.DESCRIPTOR_INSTANCE_VAR), this);
          enumModule.defineAnnotatedMethods(RubyEnum.class);
          return enumModule;
      }
  
      private IRubyObject name;
      private RubyModule klazz;
      private Descriptors.EnumDescriptor descriptor;
      private DescriptorProtos.EnumDescriptorProto.Builder builder;
  }
  